RFR: 8319244: implement JVMTI handshakes support for virtual threads [v8]

[Serguei Spitsyn]

On Sat, 18 Nov 2023 01:37:21 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

>> Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   review: add jdk_internal_vm_Continuation::done(cont) check to JvmtiEnvBase::is_vthread_alive
>
> src/hotspot/share/prims/jvmtiEnvBase.cpp line 631:
> 
>> 629:   return !jdk_internal_vm_Continuation::done(cont) &&
>> 630:          java_lang_VirtualThread::state(vt) != java_lang_VirtualThread::NEW &&
>> 631:          java_lang_VirtualThread::state(vt) != java_lang_VirtualThread::TERMINATED;
> 
> AFAIU `jdk_internal_vm_Continuation::done(cont)` is correct check that vthread is terminated and works for both mounted and unmounted vthreads.
> Then `java_lang_VirtualThread::state(vt) != java_lang_VirtualThread::TERMINATED` check is not needed

Good suggestion, thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/16460#discussion_r1398219250